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为了明确植被恢复区生物土壤结皮光合固碳活性对水热因子的响应,以露天煤矿排土场两种生物土壤结皮(藓结皮和藻结皮)为材料,通过人工气候室控制温度和水分,采用Li-6400(簇状叶室)光合仪研究生物土壤结皮光合固碳活性对9个温度、6个模拟降水量水平的响应.结果表明:藓类结皮光合固碳活性显著高于藻类结皮,温度和水分均显著影响生物土壤结皮光合固碳活性,温度、水分及结皮类型三者之间的交互效应也显著影响生物土壤结皮光合固碳活性.藓类和藻类结皮光合固碳活性的最适温度分别为20~25、15~20℃,最适降水量均为2 mm.
In order to clarify the response of photosynthetic carbon fixation of biological soil crusts to hydrothermal factors in the vegetation restoration area, two kinds of biological soil crusts (moss crusts and algal crusts) in the open pit coal mine were used as materials to control the temperature And moisture, the responses of photosynthetic carbon fixation of biological soil crusts to nine temperature and six simulated precipitation levels were studied by Li-6400 photosynthetic apparatus. The results showed that the photosynthetic carbon fixation of moss crusts was significant Above the algal crusts, both temperature and water content significantly affected the photosynthetic carbon fixation of the biological soil crusts, as well as the interaction effects of temperature, water and crust types on the photosynthetic carbon fixation of soil crusts. The optimal temperature for photosynthetic carbon fixation of algal crusts was 20-25 and 15-20 ℃, respectively, and the optimum precipitation was 2 mm.